<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <title>白墨小客栈</title>
    <link rel="icon" href="img/2.jpeg">
    <style>
        #p1 {
            color: red;
        }
    </style>
</head>

<body>
    <h1>css标签选择器</h1>
    <p id="p1">p1</p>
    <p id="2">p2</p>
    <p id="3">p3</p>
</body>

</html>